Improve scalac: use ijar and download scalac

--
Change-Id: I22fb6cc5a37f5c6c216dc3abbc915d1be3fd5e6b
Reviewed-on: https://bazel-review.googlesource.com/#/c/2410/
MOS_MIGRATED_REVID=109717610
diff --git a/WORKSPACE b/WORKSPACE
index 4bb08ed..ebe5700 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -43,3 +43,12 @@
     #   actual = "@androidndk//:files",
     actual = "//:dummy",
 )
+
+# only used for the scala rule
+new_http_archive(
+    name = "scala",
+    strip_prefix = "scala-2.11.7",
+    sha256 = "ffe4196f13ee98a66cf54baffb0940d29432b2bd820bd0781a8316eec22926d0",
+    url = "http://downloads.typesafe.com/scala/2.11.7/scala-2.11.7.tgz",
+    build_file = "tools/build_defs/scala/scala.BUILD",
+)